Building a new power system focusing on new energy resources puts forward higher requirements for deep peak shaving of coal power unit. Through the requirement analysis of power grid and the comparison of various energy storage technologies

taking the system characteristics analysis of coal power unit as the starting point

a system and a operation mode were given which were based on molten salt thermal storage to assist deep peak shaving of coal power unit. Through theoretical analysis

the calculation methods of the main parameters of subsystems including the heating

heat storage and heat exchange of the molten salt system have been put forward.Taking a 660 MW coal-fired unit as an example

based on the analysis of the thermal boundary and peak shaving demand

the power and connection mode of the electric heating module of the molten salt system are calculated using the calculation method proposed in this article. The types of molten salt and the inlet and outlet parameters of the heat exchange system are selected. The capacity

salt consumption and tank volume of molten salt heat storage are determined. All the results provide reliable data support for accurate accounting of project investment and land occupation. This system and calculation method can provide reference for the preliminary design of similar projects.